Numerical and experimental investigation of time-domain-reflectometry-based sensors for foreign object detection in wireless power transfer systems

Research output: Contribution to journalResearch articleContributedpeer-review

Abstract

Foreign object detection (FOD) is considered a key method for detecting objects in the air gap of a wireless charging system that could pose a risk due to strong inductive heating. This paper describes a novel method for the detection of metallic objects utilizing the principle of electric time domain reflectometry. Through an analytical, numerical and experimental investigation, two key parameters for the design of transmission lines are identified and investigated with respect to the specific constraints of inductive power transfer. For this purpose, a transient electromagnetic simulation model is established to obtain and compare the sensor impedance and reflection coefficients with experimental data. The measurement setup is based on parametrically designed sensors in laboratory scale, using an EUR 2 coin as an exemplary test object. Consequently, the proposed simulation model has been successfully validated in this study, providing a comprehensive quantitative and qualitative analysis of the major transmission line design parameters for such applications.

Details

Original languageEnglish
Article number9425
Number of pages16
JournalSensors
Volume23
Issue number23
Publication statusPublished - 26 Nov 2023
Peer-reviewedYes

External IDs

ORCID /0000-0003-2834-8933/work/148605253
ORCID /0000-0002-8854-7726/work/148606162
Scopus 85179129513
WOS 001116098200001
PubMed 38067799

Keywords

Keywords

  • electric time domain reflectometry, wireless power transfer, wireless charging, inductive power transfer, foreign object detection, metal object detection